Institute of Integrated Mineral Development – IPKON, Russian Academy of Sciences, Moscow, Russia:

Zakharov V. N., Director, Corresponding Member of the Russian Academy of Sciences

Federal state educational institution of the higher-education "State University of Management, Moscow, Russia:

Linnik V. Yu., Professor of Chair, Doctor of Economic Sciences, vy_linnik@guu.ru
Linnik Yu. N., Professor of Chair, Doctor of Engineering Sciences

Skuratovskiy opytno-ehksperimental’nyy zavod LLC, Tula, Russia:

Averin E. A., Engineer-Designer, Candidate of Engineering Sciences

The parameters of the cutters and their spatial orientation relative to the end of the blade of the screw Executive body have a significant impact on the power and energy performance of coal-mining combines. In the designs of the Executive bodies of combines, both domestic and foreign, equipped with tangential cutters cutting edge of the latter is located above the surface of the blade end. With such a spatial orientation of the cutter for certain values of the flow velocities, which are maximum permissible for the particular design of the harvester, the clearance between the end of the blade and the bottom becomes commensurate with the broken chunks of coal, and they are getting there begin to crush. The crushing process is accompanied by the consumption of additional energy. At the same time, the energy intensity of cutting increases and the grade of coal deteriorates. In this regard, studies were carried out to identify the extent to which the spatial orientation of the cutter affects the power and energy parameters of the cutting process. The studies were conducted with tangential prismatic (not rotary) cutters and compared with the results of cutting with radial cutters. In experiments with tangential cutters, the angle of inclination relative to the cutting plane and the angle of rotation relative to the cutting speed vector were changed. It was found that at cutting radial blades for cutting forces and feed is optimum for small values of angle of inclination of the cutter 8–12, and the lateral component of the load on the cutter from the unloaded array with increasing angle of inclination decreases, and the opposite — increasing. When cutting with tangential cutters, there is also a minimum of effort in the area of the turning angle of about 12, which corresponds to the angle of inclination of the cutter 6 degrees. In this case, there is a complete balancing of lateral loads to the right and left of the cutter at a relatively low absolute level. Due to the reduction of coal overdrawing, the energy consumption of cutting has decreased and the yield of large coal (+40 mm) has increased significantly.

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